CPU count 4, Active CPUs 2 ... huh?

I was trying to explain this to my customer, realized the below is the best explanation.

Select HELP section in your GUI and you will see: ( System ›› Configuration : Device : General)

Displays the total number of processors that are active in the system. On a platform with multiple logical processors on a physical processor, shows the number of logical processors for CPU Count, while the Active CPUs section shows the status of physical processors. Note that there is always only one TMM executing on the physical core at any time. This is correct behavior.